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Maintenance and Failover in the BGF Overview
By providing redundancy for both the Routing Engine and the
service PICs, the BGF high-availability (HA) architecture allows for
a multilevel redundant solution. This solution ensures service and
call continuity, which is necessity for VoIP services.
Figure 24 shows the BGF HA
architecture.
Figure 24: BGF HA Architecture
Table 12 indicates
how service PIC or MS-DPC failure and Routing Engine failure affect
different types of services.
Table 12: How Service PIC and
Router Engine Failures Affect Service and Call Continuity
Service Service PIC or MS-DPC Failure Routing Engine Failure
Stable H.248 contexts
Call continuity—All calls are lost.
Service continuity—Provided when the backup PIC or DPC
is available.
Call continuity—All existing calls are maintained through
the failure
Service continuity—New calls and session can be established
when the backup Routing Engine takes control.
H.248 contexts are modified
Call continuity—All existing call states are lost.
Service continuity—Calls and sessions that are in a Setup
state (gates and terminations not fully defined) are lost
Call continuity—All existing call states are lost.
Service continuity—Calls and sessions that are in a Setup
state are lost.
Connection to the gateway controller
Call continuity—All calls are lost.
Service continuity—Provided when the backup service PIC
or DPC is available.
Call continuity—No calls are lost.
Service continuity—Provided when the backup Routing Engine
takes control.
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